from abstract_instrument import abstract_instrument
  import socket
  
  #==============================================================================
  
  ALL_VAL_TYPE = ['TEMP', 'RES']
  ALL_CHANNELS = ['a', 'b', 'c', 'd']

  ADDRESS = "192.168.0.12"

  CONF_VAL_TYPE = ['krdg?', 'srdg?']
  
  #==============================================================================
  
  class LS350(abstract_instrument):

  	def __init__(self, channels, vtypes, address):
  		self.address = address
  		self.port = 7777
  		self.channels = channels
  		self.vtypes = vtypes

  	def model(self):
  		#self.send("*IDN?")
  		#return self.read()
  		return "LS350"

  	def connect(self):
  		print('Connecting to device @%s:%s...' %(self.address, self.port))
  		self.sock = socket.socket(socket.AF_INET,
  							 socket.SOCK_STREAM,
  							 socket.IPPROTO_TCP)
  		self.sock.settimeout(10.0)	# Don't hang around forever
  		self.sock.connect((self.address, self.port))
  		print('  --> Ok')
  		print(self.model())
  		self.configure()

  	def configure(self):
  		self.strCh = ''
  		for ch in self.channels:
  			self.strCh = self.strCh + '%s %s;'%(CONF_VAL_TYPE[ALL_VAL_TYPE.index(self.vtypes[self.channels.index(ch)])], ch)
  		self.strCh = self.strCh[0:-1]
  		print(self.strCh)

  	def getValue(self):
  		self.send(self.strCh)
  		return self.read()

  	def read(self):
  		self.send("++read eoi")
  		ans = ''
  		nb_data_list = []
  		nb_data = ''
  		try:
  			while ans != '
  ':
  				ans = self.sock.recv(1)
  				nb_data_list.append(ans) # Return the number of data
  			list_size = len(nb_data_list)
  			for j in range (0, list_size):
  				nb_data = nb_data+nb_data_list[j]
  			return nb_data
  		except socket.timeout:
  			print "Socket timeout error when reading."
  			raise

  	def disconnect(self):
  		self.send('MODE0')
  		self.sock.close()

  	def send(self, command):
  		self.sock.send("%s
  "%command)